B1990

Code

Other B — Body

Pedal Forward / Rearward Potentiometer Feedback Circuit Failure

Brand: Other

Type: B — Body

Views: UK: 29 EN: 54 RU: 33

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Open, short to ground, or short to battery in the pedal sensor signal or reference wiring
Corroded, loose, or damaged pedal sensor connector or terminals
Failed pedal position potentiometer / accelerator pedal module
Poor ground at pedal sensor or ECU
Faulty PCM/ECU input circuit or internal component failure
Software/calibration error or intermittent contact inside pedal assembly

Retrieve freeze-frame and live data with a scan tool to see pedal sensor voltages and behavior
Visually inspect pedal assembly connector and wiring for damage, corrosion, or loose pins
Backprobe pedal sensor harness to measure reference voltage and signal(s) with key ON
Check for proper ground continuity from sensor ground to chassis/ECU
Wiggle wiring harness and connector while monitoring live data to reproduce fault
Compare both potentiometer signals (if dual) for expected correlation or inverse relationship

Reference voltage: typically ~5.0 V (check manufacturer spec) present at sensor with key ON
Signal voltage range: approximately 0.2–4.8 V across pedal travel (manufacturer-specific range)
Dual-sensor behavior: two independent signals that change with pedal travel — commonly one rises while the other falls or both rise with different slopes
Short to ground: signal near 0 V; short to battery: signal near reference voltage
Open circuit: no signal or intermittent spikes/dropouts on scan tool

Read trouble codes and note freeze frame. Clear codes and attempt to reproduce the fault while monitoring live pedal sensor data.
Perform a visual inspection of pedal, connector and harness for damage, corrosion, pin push-out, or aftermarket modifications. Repair any visible damage.
With key ON (engine OFF), backprobe the connector: verify reference voltage (≈5 V), sensor ground, and measure signal voltage(s) at rest and while moving the pedal. Confirm voltages change smoothly through full travel.
If reference or ground is missing or out of range, trace wiring to find open or poor ground and repair. Check for parasitic shorts to other circuits.
If voltages are intermittent or out of range at the connector, disconnect the pedal connector and check resistance across sensor terminals while moving the pedal. Replace pedal assembly if internal resistance is out of specification or jumps.
If sensor signals are correct at the pedal connector but fault persists, inspect harness continuity to ECU and test for short to Vb or ground between connector and ECU input.
If wiring and sensor check good, test or replace ECU input module only after confirming harness and sensor integrity and checking for technical service bulletins or software updates.
After repair or replacement, clear codes, perform any required pedal/TA calibration or relearn procedure, and verify normal operation on road test.

Damaged wiring harness near pedal (pinched, chafed from steering column movement)
Water ingress/corrosion at pedal connector
Failed dual potentiometer inside the pedal assembly
Poor connector mating or bent pins
Aftermarket pedal or connector modification